The correct use of the multimeter - Solutions - Huaqiang Electronic Network

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(1) Jack Selection

The red test lead should be connected to the jack marked with a "+" symbol, while the black test lead should be connected to the jack marked "-". This ensures correct polarity and prevents damage to the device or inaccurate readings.

(2) Measuring Gear Selection

When using a multimeter, rotate the selector switch to the appropriate position based on what you are measuring. It's crucial to choose the right gear carefully. Improper selection can lead to instrument damage or even injury.

(3) Range Selection

When measuring AC/DC voltage or current, it's best to select a range that allows the pointer to move in the upper two-thirds of the scale for more accurate results. For resistance measurements, aim to have the pointer near the center of the scale, ideally between 1/10 and 10 times the measured value.

(4) Correct Reading

Read the value indicated by the pointer on the corresponding scale based on the measurement type and selected range. Ensure your eyes are aligned with the scale for an accurate reading. Avoid parallax errors by looking directly at the display.

(5) Using the Ohm Range

A. Always perform zero adjustment before each resistance measurement. B. Never measure resistance in a live circuit. C. Avoid measuring resistances with parallel branches, as this may result in an incorrect equivalent resistance. D. When testing transistors, use R×10 or R×1K range due to their low voltage and current tolerance. E. Do not use the ohm range to measure sensitive devices like micro-ammeters, galvanometers, or standard batteries. Also, avoid shorting the test leads during use.

(6) Safety Precautions

A. Never touch the metal part of the test leads with your hands. This can cause electric shock or affect measurement accuracy. B. Do not switch the selector switch while the device is powered on. This can create high-voltage arcs that may damage the switch or contacts. C. When measuring DC voltage combined with AC, ensure the switch can handle the total voltage. Excessive voltage may cause insulation breakdown. D. After finishing use, always set the selector switch to the highest AC voltage range or the "OFF" position to protect the meter from accidental damage.